Gas-insulated switchgear

Abstract

To obtain a gas-insulated switchgear which can cancel the reaction force of a bellows to extend by gas pressure without using a spring material, and can reduce the burden of a load to a frame and a foundation.SOLUTION: The gas-insulated switching apparatus 100 includes a pair of tanks 1 disposed such that end portions thereof face each other with a gap therebetween, a bellows 2 disposed between the pair of tanks 1 and connecting the pair of tanks 1, and a link mechanism 4 that converts a reaction force of the bellows 2 trying to extend into a load that cancels the reaction force by relatively operating a plurality of connected members.SELECTED DRAWING: Figure 1

Description

[Technical Field]

[0001] The present disclosure relates to gas-insulated switchgear. [Background technology]

[0002] Conventionally, a gas-insulated switchgear has been known that includes a pair of tanks arranged with their ends facing each other at a distance from each other, and a bellows disposed between the pair of tanks to connect them. The tanks are supported by a base fixed to a foundation such as concrete. The bellows are provided to absorb expansion and contraction of the tanks due to, for example, temperature changes. In a gas-insulated switchgear, a load acts on the base supporting the tanks and the base on which the base is installed due to a reaction force caused by the expansion of the bellows due to the gas pressure of the gas sealed inside the tanks. For this reason, gas-insulated switchgears have been designed to have sturdy bases and foundations that can withstand the load. However, building sturdy bases and foundations requires time and cost. Therefore, for example, Patent Document 1 discloses a configuration that includes a spring mechanism that compensates for the reaction force caused by the gas pressure in the bellows and a load-reducing lever that reduces the load on the spring mechanism in order to reduce the load on the base and foundation. [Prior art documents] [Patent documents]

[0003] [Patent Document 1] Japanese Patent Application Laid-Open No. 2008-263707 Summary of the Invention [Problem to be solved by the invention]

[0004] However, the technology disclosed in Patent Document 1 requires expensive spring material for the spring mechanism, and has a complex configuration that combines the spring mechanism with a load-reducing lever, which may increase manufacturing costs.

[0005] The present disclosure has been made in view of the above, and aims to provide a gas-insulated switchgear that can cancel out the reaction force of a bellows that tends to expand due to gas pressure without using spring material, thereby reducing the load on the frame and foundation. [Means for solving the problem]

[0006] In order to solve the above-mentioned problems and achieve the object, the gas-insulated switchgear according to the present disclosure is characterized by comprising a pair of tanks arranged with their ends facing each other with a gap between them, a bellows arranged between the pair of tanks and connecting the pair of tanks, and a link mechanism that converts the reaction force of the bellows attempting to expand into a load that counteracts the reaction force by moving multiple connected members relative to each other. [Effects of the Invention]

[0007] The gas-insulated switchgear according to the present disclosure has the advantage that it is possible to cancel out the reaction force that causes the bellows to expand due to gas pressure without using spring material, thereby reducing the load on the frame and foundation. [Brief explanation of the drawings]

[0008] [Figure 1] FIG. 1 is a front view showing a gas-insulated switchgear according to a first embodiment; [Figure 2] FIG. 1 is an enlarged view of a link mechanism of a gas-insulated switchgear according to a first embodiment; [Figure 3] FIG. 1 is an explanatory diagram showing a link mechanism of the gas-insulated switchgear according to the first embodiment, illustrating how a reaction force of the bellows, which tends to expand due to gas pressure, is converted into a pressure load that cancels the reaction force. [Figure 4] FIG. 10 is a front view showing a gas-insulated switchgear according to a second embodiment. [Figure 5] FIG. 10 is an explanatory diagram showing a link mechanism of a gas-insulated switchgear according to a second embodiment, illustrating how a reaction force of a bellows that tries to expand due to gas pressure is converted into a pressure load that cancels the reaction force. [Figure 6]FIG. 10 is a front view showing a modified example of the gas-insulated switchgear according to the second embodiment. [Figure 7] FIG. 10 is an explanatory diagram showing a link mechanism of a modified example of the gas-insulated switchgear according to the second embodiment, illustrating how a reaction force of the bellows that tries to expand due to gas pressure is converted into a tensile load that cancels the reaction force. DETAILED DESCRIPTION OF THE INVENTION

[0009] Hereinafter, a gas-insulated switchgear according to an embodiment of the present disclosure will be described in detail with reference to the drawings.

[0010] Embodiment 1 Fig. 1 is a front view showing a gas-insulated switchgear according to embodiment 1. As shown in Fig. 1, the gas-insulated switchgear 100 according to embodiment 1 includes a pair of tanks 1, a bellows 2, a link mechanism 4, and a frame 7.

[0011] The pair of tanks 1 are cylindrical metal containers that house conductors and contain insulating gas. The tanks 1 are supported by a stand 7 fixed to a foundation 200 such as concrete, and are arranged with one end facing the other at a distance. Note that the stand supporting the tank 1 on the right side is omitted from Figure 1. A flange 10 is provided at the end of each tank 1.

[0012] The bellows 2 is a cylindrical metal container that houses a conductor and contains an insulating gas. The bellows 2 is disposed between the flanges 10 of the pair of tanks 1, connecting the pair of tanks 1 and absorbing thermal expansion and contraction of the tanks 1. The bellows 2 is, for example, a bellows-type bellows. The bellows shape is not limited to the single-type bellows shown in FIG. 1 , but may be a double-type bellows with multiple single-type bellows connected in series, or a multi-layer bellows with multiple single-type bellows connected in parallel. Flanges 20 and 21 are provided at both ends of the bellows 2. One flange 20 of the bellows 2 is joined to the flange 10 of the tank 1 shown on the left side of FIG. 1 with a connecting member (not shown) made of bolts and nuts. The other flange 21 of the bellows 2 is joined to the flange 10 of the tank 1 shown on the right side of FIG. 1 with a connecting member (not shown) made of bolts and nuts. This allows the pair of tanks 1 and the bellows 2 to be airtightly joined. The bellows 2 is not limited to a bellows-type bellows, but may be, for example, a slide-type bellows. An insulating spacer may be provided between the tank 1 and the bellows 2.

[0013] The bellows 2 is provided with a tie rod 3 that is arranged along the direction X in which the bellows 2 expands and contracts, and that connects flange portions 20, 21 provided at both ends of the bellows 2. One end of the tie rod 3 is fastened to one of the flange portions 20 by nuts 30a, 30b fastened to both sides of the flange portion 20. One end of the tie rod 3 protrudes from the outer surface of the flange portion 20 along the direction X in which the bellows 2 expands and contracts. The other end of the tie rod 3 is fastened to the outer surface side of the other flange portion 21 by a nut 31a, and is fixed to the flange portion 21. The other end of the tie rod 3 is not fastened by a nut 31b arranged on the inner surface side of the flange portion 21. This is in consideration of the expansion and contraction of the bellows 2.

[0014] Fig. 2 is an enlarged view of the link mechanism of the gas-insulated switchgear according to the first embodiment. As shown in Fig. 2, the link mechanism 4 is connected to one end of the tie rod 3, and converts the reaction force of the bellows 2, which tends to expand due to gas pressure, into a load that cancels out the reaction force by moving the connected members relatively. The link mechanism 4 in the first embodiment is a mechanism that pushes back the bellows 2 in a direction 180 degrees opposite to the direction in which the reaction force of the bellows 2, which tends to expand, is applied. The link mechanism 4 has a pair of first conversion levers 40, a pair of connecting rods 41, a second conversion lever 42, and a pressing rod 43.

[0015] The first conversion levers 40 are provided at intervals along the circumferential direction of the tank 1. The first conversion levers 40 are rotatably supported by a support member 11 fixed to the outer surface of one of the tanks 1, and convert the reaction force of the bellows 2 attempting to expand into a direction in which the pair of first conversion levers 40 face each other. In the case of Figures 1 and 2, the direction in which the pair of first conversion levers 40 face each other is the up-down direction. One end of the tie rod 3 is connected to the first conversion lever 40, and when the tie rod 3 expands due to the expansion and contraction of the bellows 2, the first conversion lever 40 rotates clockwise or counterclockwise in conjunction with the expansion of the tie rod 3.

[0016] The connecting rod 41 connects the first conversion lever 40 and the second conversion lever 42. One end of the connecting rod 41 is connected to the first conversion lever 40, and moves in the direction in which the pair of first conversion levers 40 face each other, i.e., in the vertical direction, in conjunction with the rotation of the first conversion lever 40. The other end of the connecting rod 41 is fixed to the second conversion lever 42.

[0017] The second conversion lever 42 is disposed between the pair of first conversion levers 40 and is connected to the first conversion levers 40 via a connecting rod 41. For example, the second conversion lever 42 has a V-shaped configuration made up of two link members 42a and 42b. One end of the link members 42a and 42b is rotatably connected by a joint member 42c. The other end of the connecting rod 41 connected to the upper first conversion lever 40 of the pair of first conversion levers 40 is connected to the link member 42a. The other end of the connecting rod 41 connected to the lower first conversion lever 40 of the pair of first conversion levers 40 is connected to the link member 42b. The second conversion lever 42 converts the direction of the reaction force of the bellows 2 converted by the first conversion lever 40 into a direction that pushes back the bellows 2.

[0018] The pressure rod 43 converts the reaction force of the bellows 2 transmitted from the second conversion lever 42 into a load that counteracts the gas pressure and pushes back the bellows 2. One end of the pressure rod 43 is connected to the joint member 42c of the second conversion lever 42. The other end of the pressure rod 43 is provided with a pressure plate 43a that abuts against the flange portion 20 of the bellows 2. The pressure rod 43 is supported by a support member 12 fixed to the outer surface of one of the tanks 1 so as to be movable in the direction in which the bellows 2 expands and contracts.

[0019] The link mechanism 4 having the above configuration may be provided on the rear side, top side, or bottom side of the gas-insulated switchgear 100 in addition to the front side shown in Fig. 1. The installation positions and number of link mechanisms 4 are designed according to the reaction force of the bellows 2 that tends to expand due to the gas pressure.

[0020] FIG. 3 is an explanatory diagram showing a link mechanism of the gas-insulated switchgear according to the first embodiment, illustrating how a reaction force of the bellows, which tends to expand due to gas pressure, is converted into a pressure load that counteracts the reaction force. As shown in FIG. 3 , in the link mechanism 4 configured as described above, when the bellows 2 expands due to gas pressure, the tie rod 3 expands along the direction X in which the bellows 2 expands and contracts, thereby rotating the first conversion lever 40. For example, the upper first conversion lever 40 shown in FIG. 3 rotates counterclockwise to move the connecting rod 41 downward. On the other hand, for example, the lower first conversion lever 40 shown in FIG. 1 rotates clockwise to move the connecting rod 41 upward. As the upper and lower connecting rods 41 move, the second conversion lever 42 rotates the two link members 42a and 42b around the joint member 42c so that the V-shaped gap narrows, and the pressing rod 43 presses the pressing rod 43 against the flange portion 20 of the bellows 2. That is, the link mechanism 4 converts the reaction force of the bellows 2, which tends to expand due to the gas pressure, into a pressure load that cancels out the reaction force, by the pressure plate 43a of the pressure rod 43 contacting and pushing back against the flange portion 20 of the bellows 2.

[0021] As described above, the gas-insulated switchgear 100 according to the first embodiment includes a pair of tanks 1 arranged with their ends facing each other with a gap between them, a bellows 2 arranged between the pair of tanks 1 and connecting the pair of tanks 1, and a link mechanism 4 that converts a reaction force acting on the bellows 2 to expand into a load that cancels the reaction force by moving a plurality of connected members relative to each other. The bellows 2 has flanges 20, 21 provided at both ends and a plurality of tie rods 3 connecting the flanges 20, 21 at both ends. The link mechanism 4 is arranged along the circumferential direction of one of the tanks 1, and includes a pair of first conversion levers 40 connected to one end of each tie rod 3 and rotating in conjunction with the reaction force of the bellows 2 attempting to expand, a pair of connecting rods 41 each having one end connected to the first conversion levers 40 and moving in conjunction with the rotation of the first conversion levers 40, a second conversion lever 42 arranged between the pair of first conversion levers 40 and connected to the other end of the connecting rod 41, converting the direction of the reaction force converted by the first conversion lever 40 into a direction pushing back the bellows 2, and a pressing rod 43 having one end connected to the second conversion lever 42 and the other end connected to the bellows 2, and pushing back the reaction force of the bellows 2 against the bellows 2. Thus, the gas-insulated switchgear 100 according to the first embodiment can cancel the reaction force of the bellows 2 attempting to expand due to gas pressure without using a spring material, thereby reducing the load on the frame 7. This reduces manufacturing costs, simplifies the foundation 200 made of concrete or the like and the mount 7, and also reduces the labor and costs involved in construction.

[0022] Embodiment 2 Next, a gas-insulated switchgear 101 according to a second embodiment will be described. Fig. 4 is a front view showing the gas-insulated switchgear according to the second embodiment. The gas-insulated switchgear 101 according to the second embodiment has a link mechanism 5 having a structure different from the link mechanism 4 of the gas-insulated switchgear 100 according to the first embodiment.

[0023] 4, the link mechanism 5 is connected to one end of the tie rod 3, and converts the reaction force of the bellows 2, which tries to expand due to the gas pressure, into a load that cancels the reaction force by converting it into a direction approximately 90 degrees from the direction in which the reaction force is applied. The link mechanism 5 has a pair of conversion levers 50 and a connecting rod 51.

[0024] The conversion levers 50 are provided at intervals along the circumferential direction of the tank 1. The conversion levers 50 are rotatably supported by a support member 11 fixed to the outer surface of one of the tanks 1, and convert the reaction force of the bellows 2 attempting to expand into a direction in which the pair of conversion levers 50 face each other. In the case of Figure 4, the direction in which the pair of conversion levers 50 face each other is the up-and-down direction. One end of the tie rod 3 is connected to the conversion lever 50, and when the tie rod 3 expands due to the expansion and contraction of the bellows 2, the conversion lever 50 rotates clockwise or counterclockwise in conjunction with the expansion of the tie rod 3.

[0025] The connecting rod 51 connects the pair of conversion levers 50. One end of the connecting rod 51 is connected to one of the pair of conversion levers 50, and the other end is connected to the other conversion lever 50. The position of the connecting rod 51 is fixed by a fixing member 8. As an example, the fixing member 8 is formed as a part of the base 7. The fixing member 8 is disposed so as to surround a part of the periphery of the connecting rod 51, and is fixed to the outer surface of one of the tanks 1. The fixing member 8 is not limited to being a part of the base 7, and may be provided as a separate member from the base 7.

[0026] FIG. 5 is an explanatory diagram showing a link mechanism of a gas-insulated switchgear according to a second embodiment, which converts a reaction force of the bellows 2, which tends to expand due to gas pressure, into a pressure load that counteracts the reaction force. As shown in FIG. 5 , when the bellows 2 expands due to gas pressure, the link mechanism 5 causes the tie rod 3 to expand along the direction X of the expansion and contraction of the bellows 2, thereby rotating the conversion lever 50. The upper conversion lever 50 shown in FIG. 5 rotates counterclockwise and applies a downward force to the connecting rod 51. Meanwhile, the lower conversion lever 50 shown in FIG. 5 rotates clockwise and applies an upward force to the connecting rod 51. At this time, a compressive load is applied to the connecting rod 51 by the upper and lower conversion levers 50. That is, the link mechanism 5 converts a reaction force of the bellows 2, which tends to expand due to gas pressure, into a compressive load that counteracts the reaction force. In this case, the connecting rod 51 needs to have sufficient strength to withstand buckling against the compressive load.

[0027] FIG. 6 is a front view showing a modified example of the gas-insulated switchgear according to the second embodiment. FIG. 7 is an explanatory diagram showing a link mechanism of the modified example of the gas-insulated switchgear according to the second embodiment, illustrating how a reaction force of the bellows 2 attempting to expand due to gas pressure is converted into a tensile load that cancels out the reaction force. The link mechanism 5A shown in FIG. 6 differs from the link mechanism 5 shown in FIG. 4 in the configuration of the converting lever 50. Specifically, as shown in FIG. 7, the converting lever 50 of the link mechanism 5A converts the reaction force of the bellows 2 attempting to expand into a direction opposite to the direction in which the pair of converting levers 50 face each other. The upper converting lever 50 shown in FIG. 7 rotates clockwise to apply an upward force to the connecting rod 51. On the other hand, the lower converting lever 50 shown in FIG. 7 rotates counterclockwise to apply a downward force to the connecting rod 51. At this time, a tensile load is applied to the connecting rod 51 by the upper and lower converting levers 50. That is, the link mechanism 5A converts the reaction force of the bellows 2 attempting to expand due to gas pressure into a tensile load that cancels out the reaction force. In this case, the connecting rod 51 must have sufficient strength to withstand a tensile load.

[0028] As described above, in the gas-insulated switchgear 101 according to the second embodiment, it is possible to cancel the reaction force of the bellows 2 that tends to expand due to the gas pressure without using a spring material, and to reduce the load on the frame 7. This reduces manufacturing costs, simplifies the foundation 200 made of concrete or the like, and the frame 7, and also reduces the labor and cost required for construction.

[0029] The configurations shown in the above embodiments are merely examples, and may be combined with other known technologies or may be combined with other embodiments. Furthermore, it is also possible to omit or modify part of the configurations without departing from the spirit of the invention. [Explanation of symbols]

[0030] 1 tank, 2 bellows, 3 tie rod, 4, 5, 5A link mechanism, 7 frame, 8 fixing member, 10, 20, 21 flange portion, 11, 12 support member, 30a, 30b, 31a, 31b nut, 40 first conversion lever, 41, 51 connecting rod, 42 second conversion lever, 42a, 42b link member, 42c joint member, 43 pressure rod, 43a pressure plate, 50 conversion lever, 100, 101 gas-insulated switchgear, 200 foundation.

Claims

1. a pair of tanks arranged with their ends facing each other at a distance from each other; a bellows disposed between the pair of tanks and connecting the pair of tanks; and a link mechanism that converts a reaction force of the bellows attempting to expand into a load that cancels the reaction force by moving the connected multiple members relative to each other.

1. A gas-insulated switchgear comprising:

2. the bellows has flange portions provided at both ends and a plurality of tie rods connecting the flange portions at both ends, The link mechanism includes a pair of first conversion levers that are arranged along the circumferential direction of one of the tanks, connected to one end of each of the tie rods, and rotate in conjunction with a reaction force that causes the bellows to expand; a pair of connecting rods each having one end connected to each of the first conversion levers and moving in conjunction with the rotation of the first conversion levers; a second conversion lever disposed between the pair of first conversion levers, connected to the other end of each of the connecting rods, and converting the direction of the reaction force converted by the first conversion lever into a direction pushing back the bellows; a pressure rod having one end connected to the second conversion lever and the other end connected to the bellows, and which pushes back the reaction force of the bellows against the bellows.

2. The gas-insulated switchgear according to claim 1.

3. the bellows has flange portions provided at both ends and a plurality of tie rods connecting the flange portions at both ends, The link mechanism includes a pair of conversion levers that are arranged along the circumferential direction of one of the tanks, are connected to one end of each of the tie rods, and rotate in conjunction with a reaction force that causes the bellows to expand; a connecting rod connecting the pair of conversion levers, The position of the connecting rod is fixed by a fixing member.

2. The gas-insulated switchgear according to claim 1.

4. Further, a platform is provided on the ground to support the tank; The fixing member is a part of the mount.

4. The gas-insulated switchgear according to claim 3.

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